﻿I] 
  Historical 
  Review 
  : 
  Third 
  Period 
  43 
  

  

  ' 
  ' 
  Covering 
  the 
  southern 
  part 
  of 
  the 
  L,ower 
  Claiborne 
  area 
  and 
  

   all 
  of 
  the 
  Jackson 
  and 
  Vicksburg, 
  excepting 
  small 
  spots, 
  and 
  

   extending 
  over 
  the 
  Grand 
  Gulf, 
  are 
  deep 
  quartz 
  sands 
  some- 
  

   times 
  with 
  gravel, 
  which 
  bear 
  a 
  growth 
  of 
  long-leaf 
  pine. 
  

   These 
  sands 
  rest 
  unconformably 
  on 
  the 
  lower 
  terranes. 
  The 
  

   name 
  Spa7'ta 
  Sands 
  is 
  proposed 
  for 
  them." 
  

  

  Vaughan 
  published 
  as 
  Bulletin 
  No. 
  142 
  of 
  the 
  U. 
  S. 
  Geol. 
  

   Survey, 
  1896, 
  practically 
  the 
  above 
  notes 
  plus 
  a 
  bibliography 
  ; 
  

   list 
  of 
  fossils, 
  with 
  localities 
  ; 
  and 
  description 
  of 
  several 
  new 
  

   molluscan 
  species, 
  with 
  figures. 
  

  

  Clcndenin. 
  — 
  W. 
  W. 
  Clendenin 
  in 
  1894 
  continued 
  the 
  work 
  

   begun 
  by 
  Dr. 
  Lerch. 
  He 
  was 
  connected 
  with 
  both 
  the 
  Univer- 
  

   sity 
  and 
  the 
  Experiment 
  Stations. 
  Six 
  months 
  were 
  spent 
  in 
  

   the 
  University 
  and 
  six 
  mouths 
  in 
  the 
  field. 
  During 
  the 
  summer 
  

   of 
  1894 
  and 
  '95 
  he 
  was 
  engaged 
  in 
  an 
  examination 
  of 
  the 
  

   " 
  Florida 
  Parishes 
  of 
  East 
  Louisiana 
  and 
  the 
  Bluff, 
  Prairie 
  and 
  

   Hill 
  Lands 
  of 
  Southern 
  Louisiana. 
  His 
  report 
  on 
  this 
  area 
  

   appeared 
  in 
  1896, 
  as 
  part 
  III 
  of 
  Geology 
  and 
  Agriculture. 
  The 
  

   general 
  topographical 
  features 
  of 
  the 
  region 
  are 
  discussed 
  and 
  

   the 
  terms 
  Lafayette 
  and 
  Columbia 
  substituted 
  for 
  Hilgard's 
  old 
  

   Orange 
  Sand 
  and 
  Port 
  Hudson. 
  

  

  On 
  the 
  Five 
  Islands 
  he 
  worked 
  out 
  the 
  fact 
  that 
  the 
  islands 
  

   were 
  lifted, 
  in 
  part 
  at 
  least, 
  during 
  the 
  period 
  which 
  followed 
  the 
  

   deposition 
  of 
  the 
  Lafayette 
  gravel. 
  This 
  idea 
  was 
  a 
  marked 
  

   improvementon 
  Hilgard's 
  early 
  supposition 
  that 
  the 
  islands 
  were 
  

   formed 
  by 
  the 
  differential 
  erosion 
  of 
  a 
  Cretaceous 
  ridge 
  in 
  

   pre-Tertiray 
  times. 
  

  

  He 
  also 
  published 
  several 
  well 
  sections 
  in 
  southern 
  Louisiana 
  

   which 
  throw 
  considerable 
  light 
  on 
  the 
  geology 
  of 
  the 
  southwest- 
  

   ern 
  part 
  of 
  the 
  State. 
  

  

  Part 
  of 
  the 
  summer 
  of 
  1895 
  was 
  spent 
  in 
  the 
  Bluff 
  and 
  Mis- 
  

   sissippi 
  alluvial 
  lands, 
  and 
  his 
  report 
  on 
  this 
  area 
  appeared 
  as 
  

   Part 
  IV 
  of 
  Geology 
  and 
  Agriculture. 
  He 
  gives 
  a 
  general 
  dis- 
  

   cussion 
  of 
  the 
  life 
  and 
  development 
  of 
  a 
  river 
  and 
  shows 
  how 
  it 
  

   applies 
  to 
  the 
  Mississippi. 
  

  

  Johiison. 
  — 
  In 
  1899, 
  an 
  article 
  appeared 
  in 
  the 
  Philadelphia 
  

   Academy's 
  Proceedings 
  entitled 
  "New 
  and 
  Interesting 
  species 
  

   in 
  the 
  ' 
  Isaac 
  Lea 
  Collection 
  of 
  Eocene 
  Mollusca.' 
  " 
  

  

  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Phila., 
  1899, 
  pp. 
  71-82, 
  pi. 
  1-2. 
  

  

  